Exchange Transport Rule

Please help, I’m using exchange 2007, I created a transport rule to block user send email outside our organization, it works fine until today, I found out if user put an internal email address and external email both in to, then they can send email outside. Please see attachment for my rule, and how can I block this? Thank you.transport-rule.jpg

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Restore full virtual machine or individual guest files from 19 common file systems directly from the backup file. Schedule VM backups with PowerShell scripts. Set desired time, lean back and let the script to notify you via email upon completion.

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